CN108896823B - Charging resistor detection method - Google Patents
Charging resistor detection method Download PDFInfo
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- CN108896823B CN108896823B CN201810808945.4A CN201810808945A CN108896823B CN 108896823 B CN108896823 B CN 108896823B CN 201810808945 A CN201810808945 A CN 201810808945A CN 108896823 B CN108896823 B CN 108896823B
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
Abstract
The invention provides a charging resistance detection method, which comprises a BMS and a charging pile, wherein a BMS circuit network comprises an external signal input network, an analog signal acquisition network, MOS switches S1 and S2, a charging detection network resistor, an MCU, a level detection network of the MCU and a power supply. The charge detection network resistor comprises a resistor R1 and a resistor R2, the values of the resistors are known, and the power supply voltage is Ucc. The charging pile circuit network comprises a charging resistor Rx and a ground offset voltage Ux. The charging resistor detection method provided by the invention has the advantages that the resistors R1, R2 and RX form two different series-parallel circuits by controlling S1 and S2, the analog signal acquisition network acquires the voltage of the resistor R2 under different circuits, and the charging resistor Rx is measured and calculated according to ohm' S law. The method provided by the invention can efficiently and accurately measure and calculate the charging resistance value under the condition of ground offset, thereby avoiding the influence of the ground offset.
Description
Technical Field
The invention relates to the field of new energy automobiles, in particular to a charging resistor detection method.
Background
With the rapid development of new energy industry, people's acceptance to electric automobile is also higher and higher, and in the electric automobile use, it is indispensable to charge electric automobile. During the charging process, a battery management system (i.e., BMS) is required to recognize the charging resistance value to determine the rated capacity of the charging pile cable. If the ground of the electric automobile and the ground of the charging pile are equipotential, the BMS recognizes that the charging resistance value can be normally charged; however, generally, the situation that the electric vehicle and the charging pile are deviated, that is, there is a potential difference, so that the BMS cannot accurately recognize the charging resistance value of the charging pile and thus has an error, and thus cannot complete the charging.
At present, the existing charging detection method adopts a scheme of detecting level change, when a charging pile is connected, a charging resistor is connected, a charging detection unit of the BMS can output a jump level signal, an MCU can detect the level change, and detect a voltage division value of a constant value resistor in the charging resistor and the charging unit, and then the BMS determines a charging resistance value, thereby executing a charging strategy. However, when there is a ground offset, the charging unit of the BMS may not output a level signal or the detected charging resistance value is large or small, thereby causing a charging failure.
Disclosure of Invention
The invention provides a charging resistance detection method, which can be used for efficiently and accurately measuring a charging resistance value under the condition of ground deviation and then balancing potential difference so as to avoid charging failure of an electric automobile due to the influence of the ground deviation.
The technical scheme adopted by the invention for solving the technical problems is as follows: including BMS and fill electric pile, BMS circuit network includes external signal input network, analog signal acquisition network, MOS switch, charge and detect network resistance, MCU's level detection letter network and power. The MOS switch comprises S1 and S2, the charge detection network resistor comprises a resistor R1 and a resistor R2 which are all known fixed values, and the power supply voltage is Ucc. The charging pile internal circuit network comprises a charging resistor Rx and a ground offset voltage Ux.
Further, when the electric vehicle is connected with the charging pile, the charging resistor Rx is connected with the BMS, the MOS switch S1 is closed to form a circuit formed by connecting the resistor R2 and the charging resistor Rx in series, when a current flows, a level jump is detected by a level detection network of the MCU, and the analog signal acquisition network acquires the voltage value U1 of the resistor R2.
Further, according to ohm's law, equation 1 is obtained,
；
further, the MCU controls the MOS switch S2 to be closed, so as to form a circuit in which the charging resistor Rx and the resistor R1 are connected in parallel and R2 is connected in series, when a current flows, a level detection network of the MCU detects a level jump, and the analog signal acquisition network acquires the voltage value U2 of the resistor R2.
Further, according to ohm's law, equation 2 is derived,
；
further, Rx and Ux are calculated, respectively, in conjunction with equation 1 and equation 2, that is,
namely, it is
Wherein A = R1 (Uc-U2) -R2U 2, B = (Uc-U1) R1,
，D=U2-U1。
drawings
FIG. 1 is a circuit diagram of BMS and charging post connection
FIG. 2 is a circuit diagram of S1 closed, S2 open, Rx and R2 connected in series
FIG. 3 is a circuit diagram of Rx and R1 connected in parallel and then connected in series with R1 after S1 and S2 are closed
The symbols in the drawings represent the following meanings:
1-BMS, 2-charging pile, 11-external signal input network, 12-analog signal acquisition network, 13-MOS switch S1, 14-MOS switch S2, 15-charging detection network resistance, 16-MCU, 17-level detection network of MCU, 18-power supply, 151-resistor R1, 152-resistor R2.
The objects, features, and advantages of the present invention will be further explained with reference to the accompanying drawings in conjunction with specific embodiments.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in figure 1, the charging resistance detection method provided by the invention comprises a BMS (1) and a charging pile (2), wherein an internal circuit network of the BMS (1) comprises an external signal input network (11), an analog signal acquisition network (12), a MOS switch S1 (13), a MOS switch S2 (14), a charging detection network resistor (15), an MCU (16), a level detection network (17) of the MCU and a power supply (18). The charging detection network resistor (15) comprises a resistor R1 (151) and a resistor R2 (152), which are all known fixed values, and the voltage of the power supply (19) is Ucc. The charging pile (2) internal circuit network comprises a charging resistor Rx (21) and a ground offset voltage Ux (22).
When the electric vehicle is connected with the charging pile (2), the charging resistor Rx (21) is connected with the BMS (1), and the MOS switch S1 (13) is closed, so that an electric loop formed by connecting the resistor R2 (152) and the charging resistor Rx (21) in series is formed, as shown in FIG. 2. When current flows, a level jump is detected by a level detection signal network (17) of the MCU, and the voltage value U1 of the resistor R2 (152) is acquired by the analog signal acquisition network (12).
Further, according to ohm's law, equation 1 is obtained,
；
further, the MCU (17) controls the MOS switch S2 (14) to close, forming an electrical loop in which the charging resistor Rx (21) and the resistor R1 (151) are connected in parallel and connected in series with R2 (152), as shown in fig. 3. When current flows, a level jump is detected by a level detection signal network (17) of the MCU, and the voltage value U2 of the resistor R2 (152) is acquired by the analog signal acquisition network (12).
Further, according to ohm's law, equation 2 is derived,
；
further, in conjunction with equation 1 and equation 2, Rx (21) and Ux (22) are calculated, respectively, that is,
namely, it is
Wherein A = R1 (Ucc-U2) -R2U 2, B = (Ucc-U1) R1,
，D=U2-U1。
preferably, the resistors R1 (151) and R2 (152) are low-temperature-drift and high-precision resistors.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (4)
1. A charging resistance detection method is characterized by comprising the following steps:
step 1, when an electric automobile is connected with a charging pile, establishing connection between an internal circuit network of the charging pile and a BMS circuit network of the electric automobile, wherein the BMS circuit network comprises a MOS switch S1, a MOS switch S2, a resistor R1, a resistor R2 and an MCU, and the internal circuit network of the charging pile comprises a charging resistor Rx;
the MCU controls the MOS switch S1 to be closed to form an electric loop formed by connecting the resistor R2 and the charging resistor Rx in series, and when current flows, the MCU acquires a voltage value U1 of the resistor R2;
step 2, obtaining a formula 1 according to ohm's law,
wherein Ucc is a power supply voltage of the BMS circuit network, Ux is a ground offset voltage of the charging resistor Rx;
step 3, the MCU controls the MOS switch S2 to be closed to form a circuit formed by connecting the charging resistor Rx and the resistor R1 in parallel and connecting the charging resistor Rx and the resistor R1 in series with R2, and when current flows, the MCU acquires a voltage value U2 of the resistor R2;
step 4, obtaining a formula 2 according to ohm's law,
；
and step 5, combining the formula 1 and the formula 2 to respectively calculate Rx and Ux, namely,
namely, it is
Wherein A = R1 (Ucc-U2) -R2U 2, B = (Ucc-U1) R1,
，D=U2-U1。
2. the charging resistor detection method of claim 1, wherein the BMS circuit network comprises an external signal input network, an analog signal acquisition network, a MOS switch S1, a MOS switch S2, a charging detection network resistor R1, a resistor R2, an MCU, a level detection signal network of the MCU, and a power supply.
3. The charging resistance detection method of claim 2, wherein the charging detection network resistance comprises a resistor R1 and a resistor R2, which are all known fixed values.
4. The charging resistance detection method according to claim 2, wherein the power supply voltage Ucc is a fixed value.
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| CN111579872B (en) * | 2020-05-22 | 2022-09-30 | 上汽通用汽车有限公司 | System and method for monitoring automobile insulation resistance in real time |
| CN113366323B (en) * | 2020-09-21 | 2022-08-02 | 深圳欣锐科技股份有限公司 | Charging signal detection circuit and charging signal detection method |
| CN114007897B (en) * | 2020-09-21 | 2023-02-10 | 深圳欣锐科技股份有限公司 | Charging signal detection circuit and vehicle-mounted equipment |
| CN112285461A (en) * | 2020-10-13 | 2021-01-29 | 安徽锐能科技有限公司 | Ground offset detection circuit and method for national standard alternating current charging connection confirmation circuit |
| CN112285598A (en) * | 2020-10-13 | 2021-01-29 | 安徽锐能科技有限公司 | Ground offset detection device and method of slow-filling national standard connection confirmation circuit |
| CN112285599A (en) * | 2020-10-13 | 2021-01-29 | 安徽锐能科技有限公司 | Ground bias detection system and method for slow charging connection confirmation circuit |
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Address after: 518000 1-2 Floor, Building A, Xinwangda Industrial Park, No. 18 Tangjianan Road, Gongming Street, Guangming New District, Shenzhen City, Guangdong Province Patentee after: Xinwangda Power Technology Co.,Ltd. Address before: 518107 1-2 Floor, Building A, Xinwangda Industrial Park, No. 18 Tangjianan Road, Gongming Street, Guangming New District, Shenzhen City, Guangdong Province Patentee before: SUNWODA ELECTRIC VEHICLE BATTERY Co.,Ltd. |
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